题解 | #牛牛的字符菱形#

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int l = 5; //l 为奇数
        int m = l / 2 + 1;
        String c = sc.next();
        for (int i = 1; i <= m; i++) {
            for (int k = 1; k <= m - i; k++) {
                System.out.print(" ");
            }
            for (int j = 1; j <= 2 * i - 1; j++) {
                System.out.print(c);
            }
            System.out.println();
        }

        for (int i = l - m; i >= 1; i--) {
            for (int k = l - m; k >= i; k--) {
                System.out.print(" ");
            }
            for (int j = 1; j <= 2 * i - 1; j++) {
                System.out.print(c);
            }
            System.out.println();
        }
    }
}